Electric-car companyTeslahas now produced a profit for seven consecutive quarters. Tesla managed aGAAPnet income of $438 million in the first quarter, up from just $16 million one-year prior. It would appear, at least at first glance, that the electric-vehicle pioneer is on the right track in terms of profitability.The problem is that these profits aren't really coming from the cars that Tesla sells. The company currently generates hundreds of millions of dollars in pure profit each quarter fro